Unless there is a reason to have both, for this size party do either shrimp pasta or jambalaya but not both, and make it the main entree. For a shower, I would do the shrimp pasta.

4lbs. of shrimp pasta 5 lbs. jambalaya- not enough of either, this only totals about 1 1/2 ounce per person. You would start with, for example, 1 pound pasta per 10 and 1 pound tiny shrimps per 6-8.

6 lbs meatballs- OK, might go 8- 2 quarts sauce

300 finger sandwiches (ham, roast beef and turkey- 1 full sandwich per person, is plenty- no more than 240 pieces, and if you increase the pasta you could cut to 2 pieces per person.

fruit tray, use 3/4 the deluxe tray for 100 on the fruit tray page.
vegetable tray, use for 50, or do 1 classic relish tray from the veggie tray page
cheese tray, 1 pound per 10. 1 pound crackers per 15

whole sheet cake, 50 servings
48 cupcake, plenty
cookies, not needed- at most 2 small bars or cookies per 100.